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Re: Oil Leak From Manifold
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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Thu, 13 Mar 2003 12:08:46 Share Post by Email
In Reply to: Oil Leak From Manifold, TerryJ, Thu, 13 Mar 2003 03:29:36
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I assume you've addressed the Oil pressure indication - an oil leak is annoying, but true low oil pressure will destroy your engine in a matter of seconds.

A low oil pressure indication can be due to the oil level too low (below pickup), oil pressure sender failure (or shorted wire from bulb to sender), oil pump failure (unlikely), and oil pressure bypass valve failure (possible).

As to the oil leak, I'm assuming you're talking about one of the four short, fat tubes that run from the intake plenum to the actual intake ports on firewall side of the engine. Crankcase fumes are drawn off from the hose on top of the valve cover and sucked into the intake to be burned. That's why there's always a little oil in the intake system, which is normal. If it's a little bit of oil leaking out, it's probably been there for a while and you just noticed it when chasing the low oil pressure problem. I'd make sure the plenum-intake hose connection is tight, otherwise you'll have a nasty vacuum leak. If you clean it up and the leak goes away, that's fine.

If you're consuming a LOT of oil, enough that it keeps leaking out of that hose, that implies that there is a LOT of oil vapor in the crankcase. This could be due to considerable blowby from the piston rings pressurizing the crankcase and putting a lot of vapor into the air.

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